Pantograph embroidering-machine.



APPLIGATION IILED'IBB. 21, 1911 Patented Jan. 2, 1912.

2 sums-gum 1.

"FIE 2 WITNESSES:

R. ZAHN.

PANTOGRAPH EMBROIDERING MACHINE.

APPLICATION FILED PBB.21,1911

I Patented Jan. 2, 1912.

2 SHEETS-SHEET 2,

I/VVE/VTOR M W/TNESSES:

Ro anna zanmor PLA UEN, GERMANY.

PANTOGRAIPH EMBBOIDERING-MACHIN E.

Specification of Letters Patent. Application filed February 21, 1911. Serial No. 809,912.

Patented Jan. 2., 1912.

To all whom it may concern: I

Be it known that I, ROBERT ZAHN, a subject of the King of Bavaria, and resident of Plauen, Germany, have invented new and useful Improvements in Pantograph Embroidering-Machines, of which the following is a full, clear, and exact specification.

In difficult embroidery patterns, in which very'long stitches alternate with short ones, it becomes more diflicult for the operator as the machines are improved, and larger fabric frames used, the machines moving faster, to guide the fabric frame from stitch to stitch in the short instant during which the machine remains at rest for the purpose of this operation. It is. known that only the fractional part of a second is allowed for this operation. If very short stitches are to be made then the reclprocating motion of the fabric frame bymeans'of the pantograph can easily take place even if the machine is moving fast. VVhenlong stitches however are belng made, strain is laid not only on the strength of arm but also on the eyesight of the operator, as not only is it essential that the fabric frame be moved, but it is especially important that the pantograph needle at the termination of the frame' movement be located at the required point on the design. If the point be overstepped the embroidery is spoiled. The importance of this fact is increased in View of the fact that recently it has become the practice to connectthe embroidering machine with a card punching machine, which perforates a jacquard card while the embroidering operation is in progress, which jacquard card after being completed is to be used on an automatic embroidery machine; Should the operator make a mistake under these conditions in guiding the fabric frame then each mistake will be repeated in each of the hundred work operations con-' trolled by the jacquard card. This disadvan-.

tage is completely avoided in the mechanism for engaging and disengaging themachine drive in embroidery machines with pantograph controlled embroidery frame, which forms the subject of the present invention. This mcchanism'has the peculiarity that by using an electromagnetic control for the operation of the engaging and disengaging of the machine drive which is controlled by a contact on the pantograph handle, an automatic coupling on the machine driving shaft is operated by an automatic disengaging member, and the latter is made dependent on the said electromagnetic control, so that when the contact is closed for some time or.

permanently the disengaging member is put outof action, while on'the other hand when the contact is closed and opened for short" periods the disengaging member is put for a short time into an inoperative position with regard to the coupling, but is immediately brought back again into its operative or disengaging position to disengage the coupling and thereby automatically disconnect the machine drive' after a complete revolution of the machine driving shaft. This mechanism is so operated that under normal conditions, when the pattern calls for relatively short stitches, the machine is kept moving in regular time owing to the closed condition of the contact on the pantograph handle. On the other hand the op- I erator each time he has to take a long stitch on the pattern closes the contact on the pantograph handle for an instant only and thenopens it again in order that the machine which has momentarily been set in motion will again be brought to a standstill after the completion of a complete revolution of the driving shaft of the machine. The operator can then move the pantograph from one spot of the pattern to another at his leisure, and then allow the drivingshaft of the machine to start and to rotate once, that is to allow the needles to make a single stitch,

and when he has then positioned the pantograph with the necessary care and accuracy at the next stitch, he closes again shortly the contact and continues the sequence of operations mentioned above until short stitches occur in the pattern, whereupon he allows the machine to resume its uninterrupted re'gular motion.

A constructional example of the subject of the invention is illustrated in the accompanying drawings in which Figure l is a front View and Fig. 2 a partial vertical section of the apparatus. Fig. 3 illustrates the coupling in horizontal section, in a diflerent position of its parts, and Fig. 4 is a side view of the apparatus.

A driving belt pulley 2 is loosely arranged on themachine driving or main shaft 1 and runs on a journal 3 which is fixed on the shaft 1' and is provided with a longitudinal slot in which lies a prismatic coupling slide 4 together with a spring 5. The slide 4 is provided with a radially an shaft 1 is uncoupledfrom the belt 2, the slide 4 is projection 6 rests against't e the ring 9. The tapered disengagmg memranged projection 6 and the spring 5 tends to thrust it constantly in toward the machine, that is to say in Figs. 1,2 and 3, to-

ward the left, and to allow it to pass into a slot 80f a coupling ring 9 on the belt pulley 2, and there y con le-the shaft 1 with the belt pulley 2. The sli e4can he pushed to the right in such a manner that 'it can, by reason of its turning movement wlth the shaft 1, be brought, opposite to a tapered disengaging member 7. The. project1on6 of the slide 4 can then run up the tapered face of said disengaging member 7 so that it is pushed to the right and in this manner the coupling between the belt pulley 2 and the shaft 1 is disen ged.

In Fig. 2 the drlvmg belt pulley 2 1s coupled with the main shaft 1 ecause the slide. 4 is thrust 'toward' the left by the spring 5, so that its projectlon 6 is located in the slot 8 of the ring 9 of the belt pulley 2. I In Fig. 3 the slot 8 is empty, that 1s, the

pushed toward the right against the action of its s rm 7 her 7 is carried by a disengaging lever 11 movable about the pin 10 and connected to a pairof electromagnets 22. The arma-' a lever 14, 15 movahly ivoted about 'the fixed, in 13, by means 0 a connectin rod 12 (Fig. 4). A strong spring 16 ul the men ag- To the'rod 2O fixed to the machine frame, a stationary arm21 is arranged which carries ture 23 of "this'pair'of electromagnets is connected to'aninterconnectin lever 24, one end of which is movahly plvoted to a universal joint 25-26, while its other end 27 isarranged in proximity to the free edge of the rim of the belt pulley 2, which is provided with a catching notch 28 (Fig. 1).

A (pin 29 is carried by the lever 24 near the en 27 thereof and loosely engages withthe openingof the lever arm 15. The pair of electromagnets 22 lie in an electric control circuit 35 indicated in dotted lines, which leads to a contact 36 (Fi 2) on the pantograph handle 37 and a so to a normally closed interruptin switch 38 (Fig. '4).

If the pair of e ectromagnets 22 are excited,'-:wh1ch follows when the contact-36 is closed, thenthe interconnecting lever 24 is drawn; up. and. its free end 27 thereby pressed against -the edgeof therim of thepulley '2' so that this .end of the lever catches in the notch 28 of the driving pulley as this rotates and is drawn lownward by the" pulley 2 (overcoming the magnetic attraction). The pin 29 thereby carries the lever 14, 15 with it, and thus swings the disengaging lever 11 out of its normal operative or dlsengaging position, in the direction 'tion 39 on the p switch lever 40, so. that the excitation of the pair of electromagnets 22 ceases and the end 27 of the interconnectin 'pulled out of the cat-c ing notch '28 by pulley 5 and itsee edge of of thearrow 19 (Fig. 4). The disengaging member 7 thereby is out of range of the proi shaft- 1 and the driving pulley 2 is completed. Immediately thereafter the control circuit 35 is automatically broken at the contact 38 (Fig. 4 "by reason of a projecey 2 having lifted the lever '24 is a in means ofa spring 41' (Fig. 1).. ,The spring 16 then pulls the disengaging lever 11 again to the right-(Fig. 4) and thus brings the member 7 hack 1nto its operative or disen aging position relative to the coupling sli e 4., If the contact 36 is ermanently ,jection 6 of-the coupling slide 4, and this kept closed, then immediately a er the contact 38 having been closed, the lever 24 will again be drawn by the pair of electromagnets 22 against the rimof the belt pulley 2 in'order that it may catch in the notch 28 as described above, and the cycle of opera: ti'ons' already described is repeatedat each revolution of the ulley 2, t e coupling of said (pulley with t e shaftl remaining at gage Should, however, the contact 36 only he closed -fora.moment,in fact just long enough to enable the lever 24 tocatch in the notch 28 of the belt pulley 2, then the disengaging lever 11 keeps the position into which it has been pulled by the s ring 16, so that the cam shaped part of t e disengaging member 7 lies in the range of the projection 6 of the coupling slide 4. When under these conditions the shaft 1 completes a complete revolution, the coupling slide 4 is then pushed-back a ainst the action of the spring 5 by means 0 thedisengaging member-.7, and thereby the. coupling between the shaft 1 and'flthe driving ulley 2 is immediately disengaged. Immediately after a projection 30 on the journal 3 comes into engagement with a projection 31 on the lever 11 and thereby stops further rotation of the disengaged shaft 1.

"In order to allow the apparatus to be operated by hand if necessary, a vertical rod 17 is linked to the end 15 of the lever 14,15, which is within easy reach of the embroidery operators right hand, the upperend ofsaid rod being guided by a link 18. If the embroidery operator catches hold of the rod 17 with his right hand and pulls this downward, then the disengagin lever 11 is shifted over in the directlon o ithe arrow 19 and the spring 5 then forces the coupling slide 4 into the slot 8, and the coupling between the arts 1' and 2 is completed. If the embroi ery operator again le'aves go of the rod 17, then the spring 16 pulls the lever 11 back into the disengaging position, and

the decoupling of the parts 1 and 2 is then automatically completed in the manner described above.

' What I claim-is:

1. In embroidering machines, the combination of a driving member, a main shaft in the machine tobedriven by said driving of the machine, acontact device on the bandle of sa1d pantograph' for controlling said.

control circuit by hand and automaticcircult controlling means for periodically openmg sa1d. clrcult so as to allow of driving members, said contact device, when said contact is left open, permitting said disengaging-member to remain in its" operative position for roducing the disengagement of the coup ing, substantially as and for the pur ose described.

2. In embroi ering machines, the combination of a driving member, a main shaft in' the machine to be driven by said driving 'member, a coupling between said driving member and the main shaft, a movable disengaging member to control said couplin an interconnecting mechanism between sa1d disengaging and driving'members, an electromagnetic device controlling said interconnecting mechanism, a hand controlled rod connected to said interconnecting mechanism, an electric control circuit containing said electromagnetic device, a pantograph forshifting the fabric frame of the machine and a contact device on the handle of said pantograph for controlling said control circuit by hand, whereby the said interconnecting mechanism and consequently the said disengaging member for the coupling maybe controlled either elect-romagnetlcally or by hand; substantially as and forthe purpose described,

3. In embroidering. machines, the combination of a driving member, a main shaft'in the machine to be driven by said driving member, a spring controlled coupling slide connecting in its coupling position said driving member with said main shaft, a spring actuated disengaging lever, a cam an electric control cir-' periodic dlsconnection between said disengagmg and.

face carried by said lever to engage with said coupling slide when said lever is in operative positlon, for the purpose of moving position, an etween said disengagin lever and said driving, member said slide out of its coupling) interconnecting mechanism for perio ically' connecting, said driving member to sa1d disengaging member to cause said disengaging member to be shifted out of its operative position, anelectromagnetic devlce controlling said intercon nect ng mechanlsm an electrlc control onelectromagnetic devlce,

cuit containing said a pantograph for shifting the fabric frame of the machine, a. contact device on the handle of said pantograph for controlling said control circuit by hand and automatic circuit cont-rolling means for lperiodically opening said circuit so as to al ow of periodic disconnection between said disen aging and driving members, said contact evice,

when said contact is left open, permitting said disengaging-member tm remain in its operative position for producfng'the disengagement of the couplmg, substantially as and for the pur ose described.

4. In embroi ering machines,

driving member, a coupling between said driving member and said main shaft, a

to control said coupling normally held in operative position, an interconnecting lever -between sa1d disengaging lever and the driving member, said interconnecting lever be;

ing connected to the disengaging lever, an electromagnetic device controlling said interconnecting lever and arranged so as to shift it close to saiddriving member, catchin means on the latter to catch then the sa1d interconnecting lever for the purpose of positively shifting the disengaging lever out of itsoperative position, an electric control circuit containing said electromagnetic the combination of a rotary drivin member, a main shaft in the machine to e driven by said spring actuated disengaging lever adapted device, automatic electric means controlled by said driving member for producing periodic disengagement of said lnterconnecting lever from said catching means, a pantograph'for' shifting the fabric frame of the machine and a cont-act device on the handle of saidpantograph for cont-rolling saidcontrol circuitby hand, substantially as and for the purpose-described,

- In witness whereof I have hereunto signed my name this 26th day of January 1911', in the presence of two subscribing witnesses.

' ROBERT ZAHN,

Witnesses: v

LOUIS KiinLLER, ROBERT Hummer: Nmr, 

